The content of the invention
The purpose of the embodiment of the present invention is the oil production method for providing a kind of SAGD and fireflood is used in conjunction, and utilizes the present invention'sSAGD and the oil production method that fireflood is used in conjunction can solve SAGD when combining oil recovery with fireflood, the technical problem that fireflood igniting is not easy,And has channeling is not susceptible in fireflood gas injection, securely and reliably.
The above-mentioned purpose of the embodiment of the present invention can be realized using following technical proposal：
The oil production method that a kind of SAGD is used in conjunction with fireflood, comprises the following steps：
First level well, the second horizontal well, the first straight well and four the second straight wells are arranged, so as to form well pattern,
The first level well location has the first vertical section and the second vertical section for passing stratum in oil reservoir, describedThere is the to be connected with first vertical section and second vertical section between first vertical section and second vertical sectionOne horizontal segment；
Second horizontal well is located in oil reservoir, and with the 3rd vertical section and the 4th vertical section for passing stratum, it is describedThere is the to be connected with the 3rd vertical section and the 4th vertical section between 3rd vertical section and the 4th vertical sectionTwo horizontal segments, second horizontal segment are arranged on above or below the first horizontal segment, and with the first horizontal segment phaseStagger；
First straight well is stretched into the oil reservoir, and is arranged on the first horizontal segment and is intersected with second horizontal segmentThe top at place；
Second straight well is stretched into the oil reservoir, and mutually close to two second straight wells be respectively positioned on first waterThe both sides of one of vertical section of horizontal well or the second horizontal well；
Injected into the first level well, second horizontal well, first straight well and second straight well highWarm steam, so that the high-temperature steam carries out preheating oil reservoir of handling up；
Air, the first level well and second water are injected into first straight well and second straight wellHigh-temperature steam heated oil reservoir is persistently injected in horizontal well, after making oil reservoir primary combustion, stops steam injection, and make the first levelWell and the second horizontal well emission, and then make the first level well, second horizontal well, described first straightWell and second straight well connection；
Air, and the moveable igniter of tripping in are persistently injected into second straight well, by the igniter to instituteThe air stated in the second straight well is heated, so that the air after heating is combined the oil reservoir that ignites with the viscous crude in oil reservoir and produces streamDynamic oil, while persistently inject high-temperature steam to first straight well so that with the viscous crude in oil reservoir heat occurs for the high-temperature steamExchange and produce mobiloil, the first level well and second horizontal well are undertaken under self gravitation effect and flow into described firstMobiloil in horizontal well and second horizontal well, and the mobiloil is lifted to ground.
In one embodiment, second horizontal segment and the first horizontal segment are perpendicular, and first straight well is setPut in the top vertically located.
In one embodiment, the exhaust emissions amount is 1000-3000Nm3/d。
In one embodiment, the oil production method that described SAGD is used in conjunction with fireflood also includes：By the mobiloilAfter being lifted to ground, hot water is injected into second straight well, high-temperature steam is persistently injected into first straight well, to causeRemaining viscous crude is driven to the first level well and second horizontal well in oil reservoir, by the first level well and instituteState the second horizontal well and remaining mobiloil is lifted to ground.
In one embodiment, the second water of the first horizontal segment of the first level well and second horizontal wellFlat section is all located at the bottom circle of the oil reservoir；First straight well and second straight well are all perforated hole, and the perforated hole is penetratedHole section is located at the 1/2-2/3 of the oil reservoir.
In one embodiment, the first level well and second horizontal well are all screen casing sectional well completion.
In one embodiment, when steam soak preheats oil reservoir, tripping in is perpendicular through first in the first level wellThe first tubing string of straight section and at least part first horizontal segment, through the second vertical section and at least part first horizontal segmentTwo tubing strings and at least one first lifting tubing string positioned at the first vertical section and/or the second vertical section；Second horizontal wellInterior tripping in through the 3rd vertical section and at least partly the 3rd tubing string of the second horizontal segment, through the 4th vertical section and at least portionDivide the 4th tubing string of the second horizontal segment and positioned at the 3rd vertical section and/or at least one second lift tube of the 4th vertical sectionPost；The first tubing string, the second tubing string, the 3rd tubing string and the 4th tubing string are used to inject height into oil reservoirWarm steam, the first lifting tubing string and the second lifting tubing string are used to lift mobiloil to ground.
In one embodiment, the end of the first tubing string and the second tubing string is oppositely arranged；3rd pipeThe end of post and the 4th tubing string is oppositely arranged.
In one embodiment, when steam soak preheats oil reservoir, the note of tripping in first is adopted once in first straight wellTubing string, the note of tripping in second adopts a tubing string in second straight well；First note adopts a tubing string and adopts one with second noteSecondary tubing string is used for after first injecting high-temperature steam into oil reservoir, then lifts mobiloil to ground.
In one embodiment, when second straight well injects air, the second note in second straight well is adoptedOne time tubing string proposes the second straight well, the tripping in gas injection tube column in the second straight well, for persistently injecting air into the second straight well.
In one embodiment, when hot water is injected in the second oil well, the gas injection tube column in second straight well is carriedGo out the second straight well, the note of tripping in second adopts a tubing string again in the second straight well, for injecting hot water into the second straight well.
In one embodiment, the temperature of the hot water is 200 DEG C.
In one embodiment, first monitoring tubing string of the tripping in thermocouple, described second in the first tubing stringSecond monitoring tubing string of the tripping in thermocouple, threeth monitoring pipe of the tripping in thermocouple in the 3rd tubing string in tubing stringFourth monitoring tubing string of the tripping in thermocouple in post, the 4th tubing string；The first monitoring tubing string, the second monitoring pipePost, the 3rd monitoring tubing string and the 4th monitoring tubing string are used to monitor the temperature in oil well, and according to the temperature of oil wellAdjust the high-temperature steam injection rate of injection.
In one embodiment, the first tubing string, the second tubing string, the 3rd tubing string and the described 4thAt least one distributing valve is all respectively arranged with tubing string, the distributing valve is used to inject high-temperature steam into the oil reservoir.
In one embodiment, the first level segment length of the first level well is 300 meters, second horizontal wellThe second horizontal section length be 300 meters；Second straight well is 150 meters apart from adjacent upright segment length.
In summary, the oil production method being used in conjunction using the SAGD in the embodiment of the present invention and fireflood, established in preheating oil reservoirAfter thermal communication, exploited after driveing viscous crude into producing well simultaneously with fireflood using SAGD, when can effectively improve firefloodThe efficiency of gas injection igniting, and has channeling is not susceptible in gas injection process, securely and reliably.
Embodiment
With reference to the description of accompanying drawing and the specific embodiment of the invention, details of the invention can be clearly understood.ButIt is the embodiment of invention described herein, is only used for explaining the purpose of the present invention, and can not understands in any wayInto being limitation of the present invention.Under the teachings of the present invention, technical staff is contemplated that any possible change based on the present inventionShape, these are regarded as belonging to the scope of the present invention.
As depicted in figs. 1 and 2, the invention provides the oil production method that a kind of SAGD and fireflood are used in conjunction, comprise the following steps：
First level well 1, the second horizontal well 2, the first straight well 3 and four the second straight wells 4 are arranged, so as to form well pattern,The first level well 1 is located in oil reservoir 5, and with passing first vertical section 11 and the second vertical section 12 on stratum, and described theHave between one vertical section 11 and second vertical section 12 and be connected with first vertical section 11 and second vertical section 12Logical first horizontal segment 13；
The well location of second level 2 has the 3rd vertical section 21 and the 4th vertical section for passing stratum in oil reservoir 522, have between the 3rd vertical section 21 and the 4th vertical section 22 and the 3rd vertical section 21 and described 4th verticalThe second horizontal segment 23 that section 22 is connected, second horizontal segment 23 are arranged on above or below the first horizontal segment 13,And it is staggered with the first horizontal segment 13；
First straight well 3 is stretched into the oil reservoir 5, and is arranged on the first horizontal segment 13 and second horizontal segmentThe top of 23 intersections；
Second straight well 4 is stretched into the oil reservoir 5, and mutually close to two second straight wells 4 be respectively positioned on described theThe both sides of one of vertical section of one horizontal well 1 or the second horizontal well 2；
Noted into the first level well 1, second horizontal well 2, first straight well 3 and second straight well 4Enter high-temperature steam, the high-temperature steam carries out preheating oil reservoir of handling up；
Air, the first level well 1 and described second are injected into first straight well 3 and second straight well 4High-temperature steam heated oil reservoir 5 is persistently injected in horizontal well 2, after making the primary combustion of oil reservoir 5, stops steam injection；To cause describedOne horizontal well 1 and the emission of the second horizontal well 2, so make the first level well 1, second horizontal well 2,First straight well 3 and second straight well 4 connect；
Air, and the moveable igniter (not shown) of tripping in are persistently injected into second straight well 4, passes through instituteState igniter to heat the air in second straight well 4, so that the air after heating is combined with the viscous crude in oil reservoir 5The oil reservoir 5 that ignites produces mobiloil, while first straight well 3 persistently injects high-temperature steam, the high-temperature steam with oil reservoir 5Viscous crude occurs heat exchange and produces mobiloil, and the first level well 1 and second horizontal well 2 are undertaken under self gravitation effectThe mobiloil flowed into the first level well 1 and second horizontal well 2, and the mobiloil is lifted to ground.
In the present embodiment, when arranging well pattern, make first level well 1 and second level, 2 wells substantially u-shaped.During drilling well,One section of L-type horizontal well can be first drilled through, then drills through that one section of straight well is relative with the horizontal segment end of the L-type horizontal well to be connect.First waterSecond horizontal segment 23 of the horizontal well 2 of first horizontal segment 13 and second of horizontal well 1 is arranged in certain angle, makes first level well 1The first vertical section 11 and the second vertical section 12, and the 3rd vertical section 21 of the second horizontal well 2 and the 4th vertical section 22 all wearGo out stratum.First straight well 3 is arranged on the top of the first horizontal segment 13 and the intersection of the second horizontal segment 23.Four secondStraight well 4 is separately positioned on the both sides of the vertical section of 1 and second horizontal well of first level well 2, that is to say, that and mutually close to two institutesState the both sides that the second straight well 4 is respectively positioned on one of vertical section of the horizontal well 2 of first level well 1 or second.Certainly, arrangeThe order of well pattern can also be upset or at random, this is not affected to the present invention, such as first arranges the first straight well 3, soThe second straight well 4 is positioned according to the first straight well 3 afterwards, finally arranges that first level well 1 and the second horizontal well 2 are also possible.
Well pattern arrangement complete after, to the first level well 1, second horizontal well 2, first straight well 3 andInjection high-temperature steam in second straight well 4, the high-temperature steam carry out preheating oil reservoir 5 of handling up.Wherein, the temperature of high-temperature steamFor 260-330 DEG C, injection pressure is relevant with strata pressure and injection rate, and general pressure design of injecting is no more than fracture pressureCan.Fracture pressure is usually 1.8 times of stratum reset pressure, so Safety Injection pressure is usually no more than the 1.8 of strata pressureTimes.Oil reservoir 5 is gulped down by the first level well 1, second horizontal well 2, first straight well 3 and second straight well 4After entering high-temperature steam, a certain amount of mobiloil that spues is to ground.Wherein the first straight well 3 and the steam of the second straight well 4 injection 300-500t, injection length 2-3 days.The injection intensity of 1 and second horizontal well of first level well 2 is 5t/m, injection length 5-7 days.This rankSection can preheat oil reservoir 5, improve the mobility of viscous crude, has channeling when reducing fireflood；Straight well nearly well band (in 1m) mistake when reducing firefloodMore oil, during preventing after-ignition gas injection, crude oil, which returns, spits into well, causes pit shaft to burn；The temperature of oil reservoir when improving igniting, dropThe low ignition time.
After steam soak preheating oil reservoir, one round of air is injected into the straight well 4 of the first straight well 3 and second, itsMiddle air injection rate 10000Nm3/ d, injection length 7-15 days.In the first level well 1 and second horizontal well 2High-temperature steam heated oil reservoir 5 is persistently injected, after making the primary combustion of oil reservoir 5, stops steam injection；With cause the first level well 1,And the emission of the second horizontal well 2, the exhaust emissions amount are 1000-3000Nm3/ d, and then make the first levelWell 1, second horizontal well 2, first straight well 3 and second straight well 4 connect.This stage can establish entirelyThe thermal communication of layer, because steam soak warm-up phase reservoir temperature can bring up to 100 DEG C or so, reinjects air, airOxidation reaction heat release can occur with viscous crude, heat may proceed to heated oil reservoir 5, and the hot exhaust gas of formation is up walked, thus topOil reservoir 5 also preheat, excessive tail gas enter between oil reservoir 5 and cap rock, be that oil reservoir 5 is incubated sheath well.
Finally, the Joint Production stage of SAGD and fireflood is carried out, persistently injects air into second straight well 4, and underEnter moveable igniter (not shown), the duration of ignition is 7-10 days, air injection rate 10000Nm3/ d, oil reservoir can be made5 are heated to 350-400 DEG C.After having put fire, portable igniter is proposed, continues gas injection, gas injection intensity is adjusted to 250-300Nm3/Dm, after one month, gas injection intensity is improved to 300-350Nm3/d·m.By the igniter in second straight well 4Air is heated, so that the air after heating is combined with the viscous crude in oil reservoir 5, the oil reservoir 5 that ignites produces mobiloil, while instituteTo state the first straight well 1 and persistently inject high-temperature steam, the high-temperature steam occurs heat exchange with the viscous crude in oil reservoir 5 and produces mobiloil,The first level well 1 and second horizontal well 2, which are undertaken under self gravitation effect, flows into the first level well 1 and describedMobiloil in second horizontal well 2, and the mobiloil is lifted to ground.This stage can fill up before vapor chamber, carryThe mass dryness fraction of high steam, onlap degree is reduced, reduce the heat loss on stratum, improve SAGD effects.Treat the straight well Duan Wen of U-shaped horizontal wellDegree reaches 300 DEG C or so, can be transferred to next stage.
In summary, the oil production method being used in conjunction using the SAGD in the embodiment of the present invention and fireflood, established in preheating oil reservoirAfter thermal communication, exploited after driveing viscous crude into producing well simultaneously with fireflood using SAGD, when can effectively improve firefloodThe efficiency of gas injection igniting, and has channeling is not susceptible in gas injection process, securely and reliably.
In one embodiment, after the mobiloil is lifted into ground, fourth stage can be entered, to describedTwo is straight, and injection hot water, persistently injects high-temperature steam, make it that remaining viscous crude is driven in oil reservoir into first straight well 3 in 4Rush in the first level well 1 and second horizontal well 2, will be surplus by the first level well 1 and second horizontal well 2Remaining mobiloil is lifted to ground.This stage can utilize hot water the Residual oil displacement below SAGD vapor chambers and live wire to firstProduced in the horizontal well 2 of horizontal well 1 and second, increase substantially recovery ratio.
In one embodiment, second horizontal segment 23 and the first horizontal segment 13 are perpendicular, and described first is straightWell 3 is arranged on the top vertically located.That is, the angle that the second horizontal segment 23 and first horizontal segment 13 stagger is 90 °, firstStraight well 3 is located at the surface of intersection point.
In one embodiment, the of the first horizontal segment 13 of the first level well 1 and second horizontal well 2Two horizontal segments 23 are all located at the bottom circle of the oil reservoir 5；First straight well 3 and second straight well 4 are all perforated hole, described to penetrateKong Jing perforated interval is located at the 1/2-2/3 of the oil reservoir 5.
The first level well 1 and the well of the second level 2 are all screen casing sectional well completion.That is, to described firstAll at least one 3rd packer 9 of tripping in the oil jacket annular space of horizontal well 1 and second horizontal well 2, the tool of the 3rd packer 9In oil jacket annular space between the 3rd adjacent screen casing 8 of body position tripping in two.
In the present embodiment, the second horizontal segment 23 of the horizontal well 2 of first horizontal segment 13 and second of first level well 1The bottom circle of oil reservoir 5 is arranged in, the viscous crude on the bottom circle of heated oil reservoir 5, while caused mobiloil after SAGD and fireflood can be used for, canTo flow to the bottom circle of oil reservoir 5 by self gravitation effect, it is driven horizontal to the first level well 1 and second positioned at the bottom circle of oil reservoir 5Ground is lifted to again in well 2.The perforated interval of first straight well 3 and the second straight well 4 is arranged at oil reservoir 1/2-2/3, that is, is located atMiddle part of oil reservoir 5 or so, it can be used for the viscous crude at the middle part of heated oil reservoir 5.
In one embodiment, as shown in Figure 3 and Figure 4, during steam soak preheating oil reservoir, in the first level well 1Tripping in through the first tubing string 14 of the first vertical section 11 and at least part first horizontal segment 13, through the second vertical section 12 andThe second tubing string 15 of at least part first horizontal segment 13 and positioned at the first vertical section 11 and/or the second vertical section 12 at leastOne first lifting tubing string 16.Tripping in is through the 3rd vertical section 21 in second horizontal well 2 and at least partly second is horizontal3rd tubing string 24 of section 23, the 4th tubing string 25, Yi Jiwei through the second horizontal segment 23 of the 4th vertical section 22 and at least partIn at least one second lifting tubing string 26 of the 3rd vertical section 21 and/or the 4th vertical section 22；The first tubing string 14, describedTwo tubing strings 15, the 3rd tubing string 25 and the 4th tubing string 26 are used to inject high-temperature steam into oil reservoir 5, and described firstLifting tubing string 16 is used to lift mobiloil to ground with the described second lifting tubing string 26.The first tubing string 14 and the described second pipeThe end of post 15 can be oppositely arranged；The end of 3rd tubing string 24 and the 4th tubing string 25 can also be oppositely arranged.
In the present embodiment, the first tubing string 14, the second tubing string 15, the 3rd tubing string 24 and described4th tubing string 25 is all substantially L-shaped, and L-shaped tubing string docks use in U-shaped horizontal well.First lifting tubing string 16 can be below firstThe first vertical section 11 and the second vertical section 12 of horizontal well 1.Certainly, first lifting tubing string 16 can also only under in first level well1 the first vertical section 11 or only under first level well 1 the second vertical section 12.Similarly, the second lifting tubing string 26 can exist belowThe 3rd vertical section 21 and the 4th vertical section 22 of second horizontal well 2.Certainly, second lifting tubing string 26 can also only under in the second water3rd vertical section 21 of horizontal well 2 or only under the second horizontal well 2 the 4th vertical section 22.
As shown in figure 5, when steam soak preheats oil reservoir, the note of tripping in first adopts a tubing string, institute in first straight well 3State the note of tripping in second in the second straight well 2 and adopt a tubing string；First note adopts a tubing string and adopts a tubing string with second noteStructure is identical, and first note adopts a tubing string and adopts a tubing string for first injecting high temperature steaming into oil reservoir 5 with second noteAfter vapour, then mobiloil is lifted to ground.
As shown in fig. 6, when second straight well 4 injects air, the second note in second straight well 4 is adopted and once managedPost proposes the second straight well 4, the tripping in gas injection tube column 41 in the second straight well 4, for persistently injecting air into the second straight well 4.
In the second straight well 4 during injection hot water, the gas injection tube column 41 in second straight well 4 is proposed into the second straight well 4,The note of tripping in second adopts a tubing string again in second straight well 4, for injecting hot water into the second straight well 4.The temperature of the hot waterFor 200 DEG C.Injection rate is 2-5t/hm, i.e., every meter of core intersection injects 2-5t per hour.If producing well is aqueous more than 90%,And recovery percent of reserves is more than 60%.Stop hot-water flooding.
In one embodiment, first monitoring tubing string 141, described of the tripping in thermocouple in the first tubing string 14Second monitoring tubing string 151 of the tripping in thermocouple in second tubing string 15, in the 3rd tubing string 24 tripping in thermocoupleFourth monitoring tubing string 251 of the tripping in thermocouple in 3rd monitoring tubing string 241, the 4th tubing string 25；First monitoringTubing string 141, the second monitoring tubing string 151, the 3rd monitoring tubing string 241 and the 4th monitoring tubing string 251 are used to superviseThe temperature surveyed in oil well, and the high-temperature steam amount injected is adjusted according to the temperature of oil well.Tubing string is wherein monitored in horizontal segment temperatureMonitoring point 6 substantially has 10-15, can also be provided with pressure monitoring point (not shown), pressure monitoring point 4-5 or so.
In one embodiment, the first tubing string 14, the second tubing string 15, the 3rd tubing string 24, Yi JisuoState and at least one distributing valve 7 is all respectively arranged with the 4th tubing string 25, the distributing valve 7 is used to inject height into the oil reservoir 5Warm steam.The distributing valve 7 is adapted with the position of the 3rd screen casing 8 on sleeve pipe.
In addition, present invention also offers the oil production pattern and tubing string that a kind of SAGD and fireflood are used in conjunction, it includes：
First level well 1 in oil reservoir 5, it has the first vertical section 11 and the second vertical section for passing stratum respectively12, have between first vertical section 11 and second vertical section 12 and first vertical section 11 and described second verticalThe first horizontal segment 13 that section 12 is connected；The first level well 1 can be used to inject high-temperature steam, and/or lifting mobiloil is extremelyGround.
The second horizontal well 2 in oil reservoir 5, it has the 3rd vertical section 21 and the 4th vertical section for passing stratum respectively22, have between the 3rd vertical section 21 and the 4th vertical section 22 and the 3rd vertical section 21 and described 4th verticalThe second horizontal segment 23 that section 22 is connected, second horizontal segment 23 are arranged on above or below the first horizontal segment 13,And it is staggered with the first horizontal segment 13；The well of second level 2 can be used to inject high-temperature steam, and/or lifting mobiloilTo ground.
First straight well 3, it is stretched into the oil reservoir 5, and is arranged on the first horizontal segment 13 and second horizontal segmentThe top of 23 intersections；First straight well 3 is used to persistently inject high-temperature steam into oil reservoir 5.
Four the second straight wells 4, it is stretched into the oil reservoir 5, and is separately positioned on the first level well 1 and described secondThe vertical section both sides of horizontal well 2；Second straight well 4 can be used to inject high-temperature steam, and/or injection air, and/or igniting noteGas, and/or injection hot water.
The length of first horizontal segment 13 of the first level well 1 is 100-600 rice, the second water of second horizontal well 2The flat length of section 23 is 100-600 rice；Second straight well 4 is 50-300 rice apart from adjacent upright segment length.
In the present embodiment, make the horizontal well 2 of first level well 1 and second substantially u-shaped.During drilling well, can first it drill throughOne section of L-type horizontal well, then drill through that one section of straight well is relative with the horizontal segment end of the L-type horizontal well to be connect.The first of first level well 1Second horizontal segment 23 of the horizontal well 2 of horizontal segment 13 and second is arranged in certain angle, makes the first vertical section of first level well 111 and second vertical section 12, and the 3rd vertical section 21 of the second horizontal well 2 and the 4th vertical section 22 all pass stratum.First is straightWell 3 is arranged on the top of the first horizontal segment 13 and the intersection of the second horizontal segment 23.Four the second straight wells 4 are set respectivelyIn the both sides of the vertical section of 1 and second horizontal well of first level well 2.
In the present embodiment, in the first stage and second stage, injection high-temperature steam in the first level well 1,Phase III and fourth stage, the first level well 1 are used to lift mobiloil to ground.
In the first stage and second stage, injection high-temperature steam in second horizontal well 2, in phase III and fourth orderSection, second horizontal well 2 are used to lift mobiloil to ground.
In the first stage to fourth stage, high-temperature steam is all persistently injected in first straight well 3.
In the first stage, injection high-temperature steam in second straight well 4, injects in second stage, second straight well 4Air, air is persistently injected within the phase III, second straight well 4, and be provided with igniter (not shown), in fourth orderSection, the interior injection hot water of second straight well 4.
In summary, the oil production pattern being used in conjunction using the SAGD in the embodiment of the present invention and fireflood, established in preheating oil reservoirAfter thermal communication, exploited after driveing viscous crude into producing well simultaneously with fireflood using SAGD, when can effectively improve firefloodThe efficiency of gas injection igniting, and has channeling is not susceptible in gas injection process, securely and reliably, thickened oil recovery rate is high.
In one embodiment, second horizontal segment 23 and the first horizontal segment 13 are perpendicular, and described first is straightWell 3 is arranged on the top vertically located.
Preferably, the second horizontal segment 23 of the first horizontal segment 13 of the first level well 1 and second horizontal well 2It is all located at the bottom circle of the oil reservoir 5；First straight well 3 and second straight well 4 are all perforated hole, the perforation of the perforated holeSection is at the 1/2-2/3 of the oil reservoir 5.The first level well 1 and second horizontal well 2 are all screen casing sectional well completion.
In one embodiment, it is provided with the first level well 1 through the first vertical section 11 and at least partly theThe first tubing string 14 of one horizontal segment 13, the second tubing string 15 through the second vertical section 12 and at least part first horizontal segment 13,And at least one first lifting tubing string 16 positioned at the first vertical section 11 and/or the second vertical section 12；Second horizontal well 2Interior tripping in through the 3rd vertical section 21 and at least partly the second horizontal segment 23 the 3rd tubing string 24, through the 4th vertical section 22 withAnd at least partly the 4th tubing string 25 of the second horizontal segment 23 and positioned at the 3rd vertical section 21 and/or the 4th vertical section 22 extremelyFew one second lifting tubing string 26；The first tubing string 14, the second tubing string 15, the 3rd tubing string 24 and describedFour tubing strings 25 are used to inject high-temperature steam into oil reservoir 5 and monitor the temperature in oil well, the first lifting tubing string 16 and instituteThe second lifting tubing string 26 is stated to be used to lift mobiloil to ground.
The end of the first tubing string 14 and the second tubing string 15 is oppositely arranged；3rd tubing string 24 and the described 4thThe end of tubing string 25 is oppositely arranged.
In one embodiment, the first tubing string 14 includes the first oil pipe 142, described in the first horizontal segment 13At least one distributing valve 7 is provided with first oil pipe 142, the afterbody of the first oil pipe 142 is provided with seal 10；Second pipePost 15 includes the second oil pipe 152, is being provided with least one distributing valve 7 described in the first horizontal segment 13 on the second oil pipe 152,The afterbody of second oil pipe 152 is provided with seal 10.3rd tubing string 24 includes the 3rd oil pipe 242, horizontal described secondAt least one distributing valve 7 is provided with 23 the 3rd oil pipes 242 of section, the afterbody of the 3rd oil pipe 242 is provided with seal 10；InstituteStating the 4th tubing string 25 includes the 4th oil pipe 252, at least one being provided with described in second horizontal segment 23 on the 4th oil pipe 252Distributing valve 7, the afterbody of the 4th oil pipe 252 are provided with seal 10.Wherein, seal 10 is preferably plug.
Specifically, the quantity of distributing valve 7 can be set according to the length of horizontal well horizontal segment, and the position of distributing valve 7It is corresponding with the position of the 3rd screen casing 8 of horizontal well, so high-temperature steam can be caused more rapidly to be directly injected into oil reservoir 5.The position correspondence of the temperature monitoring point 6 of tubing string is monitored in the position of distributing valve 7.When monitoring tubing string detects a certain temperature monitoring pointWhen 6 temperature are higher than preset temperature, the injection rate of high-temperature steam is accordingly reduced by distributing valve 7.Conversely, when monitoring tubing string detectsWhen the temperature of a certain temperature monitoring point 6 is less than preset temperature, accordingly increase the injection rate of high-temperature steam by distributing valve 7.
In one embodiment, the first lifting tubing string 16 and the second lifting tubing string 26 are all included positioned at vertical5th oil pipe 31 of section, the lower section of the 5th oil pipe 31 are connected with oil well pump 32, be equipped with the 5th oil pipe 31 with it is describedThe sucker rod (not shown) that oil well pump 32 connects, the lower section of the oil well pump 32 be connected with turn the first screen casing 33, tail pipe 34,And seal 10.First lifting tubing string 16 and second lifts tubing string 26 and mobiloil all is lifted into ground by oil well pump 32.Seal 10 is preferably plug.Further say, mobiloil enters in oil well pump 32 through the first screen casing 33, oil well pump 32 and oil pumpingMobiloil is lifted to ground by bar again.
A tubing string is adopted provided with the first note in first straight well 3, first note is adopted a tubing string and is used for first to oil reservoir 5Mobiloil is lifted after middle injection high-temperature steam to ground.
In the first stage, a tubing string is adopted provided with the second note in second straight well 4, second note is adopted a tubing string and usedMobiloil is lifted after elder generation injects high-temperature steam into oil reservoir 5 to ground.Note is provided with second stage, second straight well 4Tracheae post 41, the gas injection tube column 41 are used to inject air into oil reservoir 5, and the horizontal well 2 of first level well 1 and second injects necessarilyAfter measuring steam, stop steam injection, carry out emission, establish the thermal communication of all oil wells in oil reservoir.In the phase III, describedThe gas injection tube column 41 with igniter (not shown) is provided with two straight wells 4, it is used for gas injection of lighting a fire, and carries out fireflood, simultaneouslyFirst straight well 3 continues steam injection, carries out SAGD productions.Adopt provided with the second note in fourth stage, second straight well 4 and once managePost, second note adopt a tubing string and are used to inject hot water into oil reservoir 5, carry out the remaining mobiloil of hot-water displacement.
First note adopts a tubing string and second note, and to adopt a tubular column structure identical, and all from well head to shaft bottom sideTo be connected with turn the 6th oil pipe 36, note adopt integrated pump 37, the second screen casing 38, tail pipe 34 and seal 10.6th oilInstlated tubular (not shown) is arranged with outside pipe 36, prevents the too high damage oil pipe of temperature.First note adopts a tubing string and instituteState the second note and adopt and the first packer 39 is designed with the oil jacket annular space of a tubing string, first packer 39 is adopted positioned at the noteThe top of integrated pump 37.Seal 10 is preferably plug.Note adopts a tubing string 35 and adopts integrated pump 37 using note first to be noted into oil reservoir 5After entering high-temperature steam, then mobiloil is lifted to ground.
The gas injection tube column 41 is connected with telescoping tube 411, the 7th oil pipe 412 and loudspeaker in turn from well head to shaft bottom directionMouth 413, the horn mouth 413 are stretched into the oil reservoir 5, and be arranged with instlated tubular outside the 7th oil pipe 412 (does not show in figureGo out), the oil jacket annular space of the gas injection tube column 41 is interior to be provided with the second packer 414, and second packer 414 is located at the loudspeakerThe top of mouth 413.Gas injection tube column 41 is used to inject air into oil reservoir 5, can also be in its moveable igniter of internal tripping in(not shown).
Each embodiment in this specification is described by the way of progressive, what each embodiment stressed be withThe difference of other embodiment, between each embodiment identical similar part mutually referring to.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the artScholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present inventionThe equivalent change or modification that Spirit Essence is made, it should all be included within the scope of the present invention.